{
  "game": "snakes",
  "displayName": "Snakes",
  "rtpPercent": 99.0,
  "rtpE8": 99000000,
  "engine": "uint32",
  "biasClass": "modulo",
  "params": [
    {
      "name": "difficulty",
      "desc": "easy/medium/hard/expert/master"
    },
    {
      "name": "rolls",
      "desc": "rolls 1–5"
    }
  ],
  "maxRolls": 5,
  "difficulty": {
    "easy": {
      "snakes": [
        7
      ],
      "tiles": {
        "2": 2000,
        "3": 1300,
        "4": 1200,
        "5": 1100,
        "6": 1044
      },
      "lowest": [
        6,
        8
      ],
      "upgrade": 1080
    },
    "medium": {
      "snakes": [
        6,
        7,
        8
      ],
      "tiles": {
        "2": 4000,
        "3": 2500,
        "4": 1400,
        "5": 1155
      },
      "lowest": [
        5,
        9
      ],
      "upgrade": 1200
    },
    "hard": {
      "snakes": [
        5,
        6,
        7,
        8,
        9
      ],
      "tiles": {
        "2": 7500,
        "3": 3000,
        "4": 1440
      },
      "lowest": [
        4,
        10
      ],
      "upgrade": 1500
    },
    "expert": {
      "snakes": [
        4,
        5,
        6,
        7,
        8,
        9,
        10
      ],
      "tiles": {
        "2": 10000,
        "3": 3910
      },
      "lowest": [
        3,
        11
      ],
      "upgrade": 4000
    },
    "master": {
      "snakes": [
        3,
        4,
        5,
        6,
        7,
        8,
        9,
        10,
        11
      ],
      "tiles": {
        "2": 17820
      },
      "lowest": [
        2,
        12
      ],
      "upgrade": 18000
    }
  },
  "note": "die = 1 + u mod 6 (two per roll); tile value by sum (mirror s→14−s, snake sums pay 0); after the first roll the lowest tier upgrades. multiplier_e8 = rtp·∏tiles_e3·1e8/(99e6·1000^k)."
}